net/ipv6/ila/ila.h

   1 /*
   2  * Copyright (c) 2015 Tom Herbert <tom@herbertland.com>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  */
  10
  11 #ifndef __ILA_H
  12 #define __ILA_H
  13
  14 #include <linux/errno.h>
  15 #include <linux/ip.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/socket.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/types.h>
  21 #include <net/checksum.h>
  22 #include <net/genetlink.h>
  23 #include <net/ip.h>
  24 #include <net/protocol.h>
  25 #include <uapi/linux/ila.h>
  26
  27 struct ila_locator {
  28         union {
  29                 __u8            v8[8];
  30                 __be16          v16[4];
  31                 __be32          v32[2];
  32                 __be64          v64;
  33         };
  34 };
  35
  36 struct ila_identifier {
  37         union {
  38                 struct {
  39 #if defined(__LITTLE_ENDIAN_BITFIELD)
  40                         u8 __space:4;
  41                         u8 csum_neutral:1;
  42                         u8 type:3;
  43 #elif defined(__BIG_ENDIAN_BITFIELD)
  44                         u8 type:3;
  45                         u8 csum_neutral:1;
  46                         u8 __space:4;
  47 #else
  48 #error  "Adjust your <asm/byteorder.h> defines"
  49 #endif
  50                         u8 __space2[7];
  51                 };
  52                 __u8            v8[8];
  53                 __be16          v16[4];
  54                 __be32          v32[2];
  55                 __be64          v64;
  56         };
  57 };
  58
  59 #define CSUM_NEUTRAL_FLAG       htonl(0x10000000)
  60
  61 struct ila_addr {
  62         union {
  63                 struct in6_addr addr;
  64                 struct {
  65                         struct ila_locator loc;
  66                         struct ila_identifier ident;
  67                 };
  68         };
  69 };
  70
  71 static inline struct ila_addr *ila_a2i(struct in6_addr *addr)
  72 {
  73         return (struct ila_addr *)addr;
  74 }
  75
  76 static inline bool ila_addr_is_ila(struct ila_addr *iaddr)
  77 {
  78         return (iaddr->ident.type != ILA_ATYPE_IID);
  79 }
  80
  81 struct ila_params {
  82         struct ila_locator locator;
  83         struct ila_locator locator_match;
  84         __wsum csum_diff;
  85         u8 csum_mode;
  86         u8 ident_type;
  87 };
  88
  89 static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
  90 {
  91         __be32 diff[] = {
  92                 ~from[0], ~from[1], to[0], to[1],
  93         };
  94
  95         return csum_partial(diff, sizeof(diff), 0);
  96 }
  97
  98 static inline bool ila_csum_neutral_set(struct ila_identifier ident)
  99 {
 100         return !!(ident.csum_neutral);
 101 }
 102
 103 void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
 104                              bool set_csum_neutral);
 105
 106 void ila_init_saved_csum(struct ila_params *p);
 107
 108 struct ila_net {
 109         struct {
 110                 struct rhashtable rhash_table;
 111                 spinlock_t *locks; /* Bucket locks for entry manipulation */
 112                 unsigned int locks_mask;
 113                 bool hooks_registered;
 114         } xlat;
 115 };
 116
 117 int ila_lwt_init(void);
 118 void ila_lwt_fini(void);
 119
 120 int ila_xlat_init_net(struct net *net);
 121 void ila_xlat_exit_net(struct net *net);
 122
 123 int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info);
 124 int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info);
 125 int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info);
 126 int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info);
 127 int ila_xlat_nl_dump_start(struct netlink_callback *cb);
 128 int ila_xlat_nl_dump_done(struct netlink_callback *cb);
 129 int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb);
 130
 131 extern unsigned int ila_net_id;
 132
 133 extern struct genl_family ila_nl_family;
 134
 135 #endif /* __ILA_H */